/* ===== BYTIAN.DEV — MAIN STYLESHEET ===== */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Syne:wght@400;600;800&display=swap');

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --cyan:    #00f5ff;
  --pink:    #ff2d78;
  --purple:  #bf5fff;
  --bg:      #080b14;
  --surface: #0d1220;
  --card:    #111827;
  --border:  rgba(0, 245, 255, 0.15);
  --text:    #e8eaf6;
  --muted:   #6b7a99;
  --mono:    'Space Mono', monospace;
  --display: 'Syne', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--display);
  overflow-x: hidden;
  min-height: 100vh;
  cursor: none;
}

/* === AMBIENT BACKGROUND === */
.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,245,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,245,255,0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: orb-float 8s ease-in-out infinite;
}
.orb1 { width: 360px; height: 360px; background: rgba(0,245,255,0.06);  top: -120px; right: -80px; animation-delay: 0s; }
.orb2 { width: 280px; height: 280px; background: rgba(255,45,120,0.05); bottom: 8%;  left: -60px; animation-delay: 4s; }

@keyframes orb-float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-28px); }
}

.cursor-glow {
  position: fixed;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,245,255,0.045) 0%, transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: left 0.08s linear, top 0.08s linear;
}

/* === LAYOUT === */
.container {
  max-width: 940px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 2;
}

section { padding: 88px 0; }

.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,245,255,0.12), transparent);
  position: relative;
  z-index: 2;
}

/* === NAV === */
nav {
  position: sticky;
  top: 0;
  background: rgba(8, 11, 20, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 16px 0;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--cyan);
  letter-spacing: 2px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo span { color: var(--pink); }

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 11px;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--mono);
  letter-spacing: 1.5px;
  transition: color 0.2s;
  cursor: none;
}
.nav-links a:hover,
.nav-links a.active { color: var(--cyan); }

/* === LANGUAGE TOGGLE === */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: 1px solid var(--border);
  padding: 5px 12px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  flex-shrink: 0;
  transition: border-color 0.2s;
}
.lang-toggle:hover { border-color: var(--cyan); }

.lang-zh,
.lang-en { transition: color 0.2s; }
.lang-sep { color: var(--muted); margin: 0 2px; }

/* active language highlight */
body[data-lang="zh"] .lang-zh { color: var(--cyan); }
body[data-lang="zh"] .lang-en { color: var(--muted); }
body[data-lang="en"] .lang-en { color: var(--cyan); }
body[data-lang="en"] .lang-zh { color: var(--muted); }

/* === HERO === */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 60px 0;
}

.hero-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--cyan);
  letter-spacing: 3px;
  border: 1px solid rgba(0,245,255,0.35);
  padding: 5px 14px;
  margin-bottom: 28px;
  opacity: 0.9;
}

.hero-name {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  line-height: 1.0;
  margin-bottom: 10px;
  letter-spacing: -2px;
}
.hero-name .outline {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--cyan);
  display: block;
}

.hero-role {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--pink);
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.hero-bio {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.95;
  max-width: 520px;
  margin-bottom: 40px;
  font-family: var(--mono);
}
.hero-bio em {
  color: var(--cyan);
  font-style: normal;
}

.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  padding: 12px 28px;
  cursor: none;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.2s, transform 0.15s;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
}
.btn:hover { opacity: 0.82; transform: translateY(-2px); }

.btn-primary { background: var(--cyan); color: var(--bg); font-weight: 700; }
.btn-outline  { background: transparent; color: var(--cyan); border: 1px solid rgba(0,245,255,0.5); clip-path: none; }
.btn-outline:hover { background: rgba(0,245,255,0.07); }

.scroll-hint {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 56px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 2px;
  animation: scroll-pulse 2s ease-in-out infinite;
}
.scroll-line { width: 40px; height: 1px; background: var(--muted); }

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1; }
}

/* === SECTION LABELS === */
.sec-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--pink);
  letter-spacing: 4px;
  margin-bottom: 10px;
}

.sec-title {
  font-size: 30px;
  font-weight: 800;
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}
.sec-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  margin-top: 10px;
}

/* === ABOUT === */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 52px;
  align-items: start;
}

.about-text {
  font-size: 14px;
  line-height: 1.95;
  color: #94a3b8;
}
.about-text + .about-text { margin-top: 16px; }
.about-text strong { color: var(--cyan); font-weight: 600; }

.skills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.skill {
  font-family: var(--mono);
  font-size: 10px;
  padding: 5px 12px;
  border: 1px solid rgba(191,95,255,0.35);
  color: var(--purple);
  background: rgba(191,95,255,0.05);
  letter-spacing: 1px;
}

.stat-col { display: flex; flex-direction: column; gap: 16px; }
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent, var(--cyan));
  padding: 20px 22px;
}
.stat-num {
  font-size: 30px;
  font-weight: 800;
  font-family: var(--mono);
  line-height: 1;
}
.stat-lab {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1.5px;
  margin-top: 6px;
}

/* === PROJECTS === */
.proj-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.pcard {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.2s;
  cursor: none;
}
.pcard::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  opacity: 0;
  transition: opacity 0.25s;
}
.pcard:hover { border-color: rgba(0,245,255,0.35); transform: translateY(-3px); }
.pcard:hover::before { opacity: 1; }

.pcard-featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
}

.pcard-num {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.pcard-name { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.pcard-desc {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 20px;
}

.pcard-visual {
  width: 120px;
  height: 120px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(0,245,255,0.04), rgba(191,95,255,0.04));
}

.pcard-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 160px;
  border-style: dashed;
  border-color: rgba(255,255,255,0.07);
}
.soon-label { font-family: var(--mono); font-size: 10px; color: var(--muted); letter-spacing: 2px; }
.soon-plus  { font-size: 28px; margin: 14px 0; opacity: 0.18; }
.soon-text  { font-family: var(--mono); font-size: 11px; color: var(--muted); }

.tags { display: flex; gap: 7px; flex-wrap: wrap; }
.tag {
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 10px;
  letter-spacing: 1px;
}
.tag-cyan   { background: rgba(0,245,255,0.08);  color: var(--cyan); }
.tag-pink   { background: rgba(255,45,120,0.08); color: var(--pink); }
.tag-purple { background: rgba(191,95,255,0.08); color: var(--purple); }

/* === BLOG === */
.blog-list { border-top: 1px solid rgba(255,255,255,0.06); }
.bitem {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  cursor: none;
  transition: padding-left 0.2s;
}
.bitem:hover { padding-left: 10px; }
.bitem:hover .btitle { color: var(--cyan); }
.btitle { font-size: 15px; font-weight: 600; transition: color 0.2s; line-height: 1.4; }
.bmeta  {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1px;
  white-space: nowrap;
  margin-left: 20px;
  flex-shrink: 0;
}

/* === CONTACT === */
.cbox {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 52px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cbox-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,245,255,0.04), transparent 60%);
  pointer-events: none;
}
.cbox-title { font-size: 26px; font-weight: 800; margin-bottom: 12px; position: relative; }
.cbox-sub {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 36px;
  position: relative;
}

.clinks { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; position: relative; }
.cbtn {
  font-family: var(--mono);
  font-size: 11px;
  padding: 10px 24px;
  letter-spacing: 1.5px;
  cursor: none;
  text-decoration: none;
  display: inline-block;
  border-radius: 2px;
  transition: opacity 0.2s, transform 0.15s;
}
.cbtn:hover { opacity: 0.8; transform: translateY(-2px); }
.cbtn-email   { background: var(--pink);  color: #fff; border: none; }
.cbtn-github  { background: transparent; color: var(--muted); border: 1px solid rgba(255,255,255,0.12); }
.cbtn-twitter { background: transparent; color: var(--cyan);  border: 1px solid rgba(0,245,255,0.35); }

/* === FOOTER === */
footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  position: relative;
  z-index: 2;
}
footer p {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1.5px;
}
footer span { color: var(--pink); }

/* === FADE-IN ANIMATION === */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === LANGUAGE SWITCH FLASH === */
@keyframes lang-flash {
  0%   { opacity: 0; transform: translateY(6px); }
  100% { opacity: 1; transform: translateY(0); }
}
.lang-switching * { animation: lang-flash 0.25s ease forwards; }

/* === RESPONSIVE === */
@media (max-width: 700px) {
  .about-grid     { grid-template-columns: 1fr; gap: 36px; }
  .proj-grid      { grid-template-columns: 1fr; }
  .pcard-featured { grid-column: span 1; grid-template-columns: 1fr; }
  .pcard-visual   { display: none; }
  .nav-links      { display: none; }
  .cbox           { padding: 32px 20px; }
  .hero-bio br    { display: none; }
}